Voldemort won. The last of the war criminals Hermione Granger is about to be publicly executed. Except - it doesn't quite work out that way. What would you do if you were thrown back twenty years in time? With nothing to lose, Hermione creates a ruthless deception. She enters Slytherin as pureblood Hermione Black - with one thing on her mind: Revenge. \\/ Unapologetic trope-abuse
Voldemort won. The Order of the Phoenix started fighting dirty. And Hermione deserted the war, weary of killing and sick of both sides. Three years later, the Order tracks her down to the muggle world and demands one last job: Infiltrate Voldemort's Hogwarts, disguised as a pureblood, and get information out of Draco Malfoy - by whatever means. Or they'll execute her for desertion.
A chance remark on the night of Halloween 1981 could have changed everything. Fate throws baby Harry into the custody of Kingsley Shacklebolt, assisted by a certain Mad-Eye Moody. And oh boy, heads will roll and history will change when this gets out. Dear Wizarding Britain: Your saviour has arrived.